维普中文期刊产品整合服务

Environmental photocatalysis:Perspectives for China

查看全文 作　　者：HERRMANN Jean [1,2]Marie 高影响力作者 机构地区：[1]Institut de Recherches sur la Catalyse et l'Environnement de Lyon;[2]UMR 5256 CNRS/Université Lyon1,2 Av.Albert Einstein 69626 Villeurbanne Cedex高影响力机构 出　　处：《Science China Chemistry》索引2010年第53卷第9期,共13页高影响力期刊 摘　　要：Photocatalysis is based on the double aptitude of the photocatalyst(essentially titania) to simultaneously adsorb reactants and absorb efficient photons.Heterogeneous photocatalysis is able to be efficient in Fine,'Green' and Environmental Chemistry.Photocatalysis induces mild oxidations in the absence of water by generating active neutral atomic O* species.For instance,the oxidation of 4-tert-butyl-toluene is 100% selective in 4-tert-butyl-benzaldehyde.In water treatment,many toxic inorganic ions are oxidized in their harmless upper oxidized state.The elimination of organic pollutants is the main field of water photocatalytic decontamination.Most of aliphatic and aromatic pollutants are totally mineralized into CO2 and innocuous inorganic anions.More complex molecules,such as pesticides(herbicides,insecticides,fungicides,etc.) or dyes,are totally destroyed.Another example of green chemistry is the total degradation of dyes in water,in particular for the azo-dyes,with 100% selective degradation of -N=N-azo-groups into di-nitrogen.Photocatalysis is also active in the 'bio-world' by killing bacteria(E.Coli,streptococcus,etc.) in water without re-growth.Air pollutants can also be destroyed,especially all the VOC's(volatile organic compounds),providing certain air humidity enabling titania to produce cracking OH* radicals.For chemical engineering reasons,the photocatalyst has to be fixed on a photo-inert support.In these conditions,UV-irradiated titania-based photocatalysis could be applied to the elimination of air pollutants,VOC's,solvents,odors,chemicals,etc.Air treatment has to be associated with water and solid waste treatment because of odors.This is conducted by covering water treatment ponds or lagunas by rafts on which large sheets of Ahlstrom paper are deposited,supporting titania associated with activated carbon.Eventually,virus AH5N2,a model virus close to H5N1,responsible for the avian flu could be totally inactivated.Photocatalysis is directly connected with all 12 principles of Green Chemistry defined by Anastas(1998) and possesses open perspectives for China. 关 键 词：PHOTOCATALYSIS green CHEMISTRY ENVIRONMENTAL CHEMISTRY air POLLUTANTS water POLLUTANTS SOLAR energy China
相关文献

参考文献(52)

引证文献(4)

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1　渝公网安备 50019002500403号　违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费